Organic magnetic member, organic ferromagnetic member, and process for producing the same, and time-responsible organic ferromagnetic member and process for controlling development of ferromagnetism

Abstract

An organic magnetic member comprises repetition units represented by the following general formula [I]: ##STR1## having at least one of R 1 and R 2 which is a substituted or unsubstituted aromatic ring, or a substituted or unsubstituted heterocyclic ring, and being spontaneously magnetized.

What is claimed is: 
     
       1. An organic ferromagnetic member, which comprises a polyacetylene compound consisting essentially of repetition units represented by the following general formula (I): ##STR14## wherein at least one of R 1  and R 2  is an unsubstituted aromatic ring or an aromatic ring substituted by a halogen atom or an alkoxy group or unsubstituted aromatic heterocyclic ring or an aromatic heterocyclic ring substituted by a halogen atom or an alkoxy group; n is a positive integer; and said polyacetylene compound being ferromagnetic. 
     
     
       2. An organic ferromagnetic member, which comprises a polyacetylene compound consisting essentially of repetition units represented by the following general formula (I): ##STR15## wherein at least one of R 1  and R 2  is an unsubstituted aromatic ring or an aromatic ring substituted by a halogen atom or an alkoxy group or an unsubstituted aromatic heterocyclic ring or an aromatic heterocyclic ring, substituted by a halogen atom or an alkoxy group; and n is a positive integer, said polyacetylene compound being brought to a temperature T 1  and then kept in a range of the temperature T 1  to a temperature T 2  for a given time to exhibit a ferromagnetism, where T 1  ≦T 2  ≦T c , and where T c  is the Curie temperature of the polyacetylene compound which is ferromagnetic. 
     
     
       3. A time-determinative organic ferromagnetic member which comprises a polyacetylene compound consisting essentially of a compound having repetition units represented by the following general formula (I): ##STR16## wherein at least one of R 1  and R 2  is an unsubstituted aromatic ring or an aromatic ring substituted by a halogen atom or an alkoxy group, or an unsubstituted aromatic heterocyclic ring or an aromatic heterocyclic ring substituted by a halogen atom or an alkoxy group; and n is a positive integer, said polyacetylene compound being brought to a temperature T 1  and kept in a temperature range of T 1  to T 2  for a given time, where T 1  ≦T 2  ≦T c , and where T c  is the Curie temperature of the polyacetylene compound which is ferromagnetic, thereby developing a ferromagnetism after the given time at said temperature T 2 , and said given time being determined by the substituted or unsubstituted aromatic ring or the substituted or unsubstituted heterocyclic ring, said time being at least 5 minutes and said temperature T 2  being no more than 115K. 
     
     
       4. An organic ferromagnetic member according to claim 2, 3 or 1, wherein said polyacetylene compound is a copolymer. 
     
     
       5. An organic ferromagnetic member according to claim 2, 3 or 1, wherein said polyacetylene compound is selected from the group consisting of poly (4-methoxyphenylacetylene), poly (4-chlorophenylacetylene) and polyphenylacetylene. 
     
     
       6. An organic ferromagnetic member, which consists essentially of repetition units represented by the following general formula (I): ##STR17## wherein at least one of R 1  and R 2  is an unsubstituted aromatic ring or an aromatic ring substituted by a halogen atom or an alkoxy group or an unsubstituted aromatic heterocyclic ring, or an aromatic heterocyclic ring substituted by a halogen atom or an alkoxy group and when any one of R 1  and R 2  is the substituent as recited above the other substituent is a hydrogen atom, wherein the organic ferromagnetic member having a ferromeganitism has an absorbance at a lower magnetic field side in the electron spin resonance spectrum than the absorbance due to the paramegnetic radical shown by the organic magnetic member of ordinary temperature, and n is a positive integer. 
     
     
       7. An organic ferromagnetic member, which consists essentially of repetition units represented by the following general formula (I): ##STR18## wherein at least one of R 1  and R 2  is an unsubstituted aromatic ring or an aromatic ring substituted by a halogen atom or an alkoxy group or an unsubstituted aromatic heterocyclic ring or an aromatic heterocyclic ring, substituted by a halogen atom or an alkoxy group and when any one of R 1  and R 2  is the substituent as recited above, the other substituent is a hydrogen atom; and n is a positive integer, said organic ferromagnetic compound having an electron spin resonance spectrum having an absorbance on a lower magnetic field side than that due to paramagnetic radical and wherein said organic ferromagnetic member has a spin density of at least 10 17  spins/g. 
     
     
       8. An organic ferromagnetic member, which comprises a polyacetylene compound consisting essentially of repetition units represented by the following general formula (I): ##STR19## wherein at least one of R 1  and R 2  is an unsubstituted aromatic ring, or an aromatic ring substituted by a halogen atom or an alkoxy group or an unsubstituted aromatic heterocyclic ring, or an aromatic heterocyclic ring substituted by a halogen atom or an alkoxy group; and n is a positive integer, wherein said compound has an electron spin resonance spectrum having an absorbance on a lower magnetic field side than that due to paramagnetic radical, and has a spin density of at least 10 17  spins/g. 
     
     
       9. A process for producing an organic ferromagnetic member, which comprises bringing a polyacetylene compound consisting essentially of repetition units represented by the following general formula (I): ##STR20## wherein at least one of R 1  and R 2  is an unsubstituted aromatic ring or an aromatic ring substituted by a halogen atom or an alkoxy, group or an unsubstituted aromatic heterocyclic ring or an aromatic heterocyclic ring, substituted by a halogen atom or an alkoxy group; and n is a positive integer, bringing said polyacetylene compound to a first temperature, and then bringing said polyacetylene compound to a second temperature which is higher than the first temperature and equal to or lower than the Curie temperature of the polyacetylene compound, and then returning to the first temperature. 
     
     
       10. A process according to claim 9, wherein the second temperature is not more than 115K.